Telephone transmitter and relay



(No Model.) 2 Sheets-Sheet 1.

T. J. PERRIN.

TELEPHONE TRANSMITTER AND RELAY.

No. 324,727. Patented Aug. 18, 1885.

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INVENTOR Tiwmas JT Terrill By his .Att eys (No Model.) 2 Sheets-Sheet 2.

T. J. PERRIN.

TELEPHONE TRANSMITTER AND RELAY.

No. 824,727. Patented Aug. 18, 1885.

INVENTOR Thomas J: leTrz'n,

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UNITED STATES PATENT Prion.

' THOMAS J. PERRIN, OF BROOKLYN, NEW YORK, ASSIGNOR TO THE NATIONAL IMPROVED TELEPHONE COMPANY, OF NEW ORLEANS, LOUISIANA.

TELEPHONE TRANSMITTER AND RELAY.

SPECIFICATION forming part of Letters Patent No. 324,727, dated August 18, 1885.

Application filed November 24, 1894. (No model.)

To all whom it may concern.-

Be it known that I, THOMAS J. PERRIN, of Brooklyn, Kings county, New York, haveinvented certain new and useful Improvements in Electric Telephone Transmitters and Relays, of which the following is a specification.

The object of my invention is to construct a simple and sensitive transmitter, which may also be used as a relay, and which is so constructed that it will transmit the loudest sounds, as well as the softer ones, without any break or rattle of the instrument.

In the accompanying drawings, Figure 1 is a transverse sectional view of my improved instrument; Fig. 2, a rear View of the diaphragm, showing the electrode-supports. Fig. 3 is a diagram View illustrating the connections and running of the circuits; and Fig. 4 is a diagram view illustrating the arrangement of the instrument as a relay or repeater.

I employ two magnets, preferably permanent magnets, A B, which are bent into halfcircles, as clearly shown in Figs. 2 and 3. They are seated in an annular socket, 0, formed in the front partition or side, 0, of the tele phone-case, and may be held in place by suitable turn'buttons, c.

The diaphragm D, which is preferably of some nonmagnetic or non-inductive metal, is seated in a depression, (1, formed in the faces of the magnets A B, adjacent to the door E of the instrument. The upper ends of these magnets are formed with right-angled rearwardly-pro- 3 5 jecting portions F, which are formed with concave sockets f on their under faces. These concaves are formed on the arc of a circle, as clearly shown, and receive the correspondingly shaped ends of soft iron swinging arms G G, which are suspended therefrom, being sustained by magnetic attraction. The swinging arms may, however, be permanent magnets, as will be obvious. These arms each carry electrodes 9, which rest in contact with corresponding opposite insulated electrodes, 9', carried by the diaphragm. Each pair of electrodes 9 g is included in an independent primary circuit of local batteries, LB LB, as clearly indicated in Fig. 3. These primaries 50 are wound alternately in the same inductioncoil I, with independent windings of a contin uous secondary line, as indicated in Fig. 3, and as fully set forth in my Patent No. 303,948, I granted to Inc August 19, 188-1. Variations of resistance occurring between the electrodes g y will cause variations of the current in the two primary circuits, which act conjointly upon the secondary, which goes to line, as is fully set forth in said patent. The lower end or pole of each magnet A B is provided with an adjustable or screw-pole extension-piece,l5[,

of soft iron, which can be adjusted with reference to the end of the swinging arm G, which hangs opposite to it. Around the end of each adjustable pole-piece H is a coil of wire, K, which is included in the secondary line,as clear- 1y shown in Fig. 3. It will now be obvious that the electrodes 9 g are maintained in contact under magnetic attraction due to the attraction of the pole-pieces Hto act upon the ends of the arms G, and the effect of the pole-pieces will be intensified by the coils K thereon.

By this construction, when the instrument is used as a transmitter, the electrodes are prevented from separating when a more than ordinarily loud sound is uttered in the Vicinity of the diaphragm. It will be perceived, however, that the instrument will also be used as a telephonic repeater, as the varying current received over the main line will traverse the coils K and give variations in the attraction of the magnets G G, as is well understood.

\Vhen used as a repeater,the main line now shown may be the receiving-line, and it will, instead of passing through the induction coil, be wound directly on the pole-pieces, and the primary circuit or circuits will be connected to act on another secondary or main line into which the received message is to be repeated. Such an arrangement is shown in Fig. 4, in which L is the receivingline wound on the pole-pieces H H, and thence put to earth, and L is the relay-line wound in the inductioncoil with the primary wires.

In order to guard against the possibility of 9 5 the arms GG being displaced or dropping from the magnet-supports F, Ipass a wire, f, through an aperture in the end of each arm G, and connect such wire to the pole-piece F of the magnet, as shown in the drawings. This wire passes loosely through the aperture in the arm, and does not interfere with its swinging motion, but should the arm become displaced on account of any unusual jar the wire will prevent it from falling.

I claim-- 1. The combination of the diaphragm, the two bent magnets AB, the Swinging arms supported magnetically from the upper poles of the bent magnets, electrodes carried by the diaphragm, and the electrodes carried by the swinging arms.

2. The combination of the diaphragm, the two bent magnets A B, the swinging arms supported magnetically from the upper poles of the bent magnets, the electrodes carried by the diaphragm, the electrodes carried by the swinging arms, and the adjustable pole' pieces in the lower ends of the bent magnets.

3. The combination of the diaphragm, the bent magnets, the swinging arms, the electrodes carried by the swinging arms and by the diaphragm, the adjustable pole-pieces of the bent magnets which act on said swinging arms, the wire coils on said pole-pieces, the secondary line in which said coils are included, and the primary transmitting-circuits.

4. The combination of a diaphragm,magnetpoles arranged in proximity to each other, near the lower edge of the diaphragm, swinging arms supported above the center of the diaphragm and hanging opposite said magnetpoles, electrodes carried on the diaphragm and on the swinging arms, an adjustable polepiece in each of said magnet-poles, the coils on the adjustable pole-pieces, the secondary circuit in which said coils are. included, and the primary transmitting-circuits.

5. The combination of a diaphragm, a magnet arranged with one pole above the center of the diaphragm and the other pole below it, a swinging arm suspended magnetically from the upper pole of said magnet, an electrode carried on said arm, the opposite electrode on the diaphragm, and an adjustable pole-piece in the lower pole of the magnet.

6. The combination of a diaphragm, a magnet arranged with one pole above the center of the diaphragm and the other pole below it, a swinging arm suspended magnetically from the upper pole of said magnet, an electrode carried on said arm, and the opposite electrode on the diaphragm.

7. The combination of the diaphragm, the magnet arranged with its pole above the center of the diaphragm, the curved socket in the magnet-pole, the swinging arm having a rounded end which fits in said socket, and is thus suspended magnetically, a contact-button carried by said arm, and the corresponding contact-button on the diaphragm. V

In testimony whereof I have hereunto subscribed my name.

THOMAS J. PERRIN.

"Witnesses:

J NO. R. J UDEN, JOHN J UDEN. 

